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Copy end of string in xstrdup

the size of a string is length of the string + 1 due to the
end of string.

--- a/wrapper.c

+++ b/wrapper.c

@@ -36,7 +36,7 @@

 char *

 xstrdup(const char *s)

 {

-	register size_t len = strlen(s);

+	register size_t len = strlen(s) + 1;

 	register char *p = xmalloc(len);

 	return memcpy(p, s, len);